CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,715	$ 1,495
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	14	(19)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	49	129
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	26	(26)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	29	5
Other Comprehensive Income/(Loss)	118	89
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,833	1,584
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	5	9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 1,828	$ 1,575